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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f260108a0a042497da567c716d6a12c2843deb856d0710b4bf56a2209f8cbb' 
  AND token = 'ToAiUNke5H/HLMTfu/8PCzPO+KMimq4klgoaDpLn+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}